W806 interior FLASH Read problem

SDK inside wm_flash_demo. c build-in flash routine, Burn chip test error, Reading problem.
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Here is the official code

int flash_demo (void) 
{
    u8 *write_buf = NULL; 
    u8 *read_buf = NULL; 
    u16 i; 

    tls_fls_init () ;                                     //initialize flash driver

    write_buf = tls_mem_alloc (TEST_FLASH_BUF_SIZE) ; 
    if  (NULL == write_buf) 
    {
        printf ("\nmalloc write buf error\n") ; 
        return WM_FAILED; 
    }

    for  (i = 0;  i  " TEST_FLASH_BUF_SIZE;  i ++) 
    {
        write_buf[i] = i + 1; 
    }

    tls_fls_write (0x1F0303,  write_buf,  1247) ;             /**verifying cross sector writing*/
    tls_fls_write (0x1F0303 + 1247,  write_buf + 1247,  2571) ; 
    tls_fls_write (0x1F0303 + 1247 + 2571,  write_buf + 1247 + 2571,  182) ; 

    read_buf = tls_mem_alloc (TEST_FLASH_BUF_SIZE) ; 
    if  (NULL == read_buf) 
    {
        printf ("\nmalloc read buf error\n") ; 
        tls_mem_free (write_buf) ; 
        return WM_FAILED; 
    }
    memset (read_buf,  0,  TEST_FLASH_BUF_SIZE) ; 
    tls_fls_read (0x1F0303,  read_buf,  TEST_FLASH_BUF_SIZE) ; 

    if  (0 == memcmp (write_buf,  read_buf,  TEST_FLASH_BUF_SIZE) ) 
    {
        printf ("\nsuccess\n") ; 
    }
    else
    {
        printf ("\nfail\n") ; 
    }

    tls_mem_free (write_buf) ; 
    tls_mem_free (read_buf) ; 

    return WM_SUCCESS; 
}

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